Rainbow-electronics ATmega64C1 Manuale Utente Scaricare il pdf (Pagina 243)

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7647A–AVR–02/08

ATmega32/64/M1/C1

• Bit 4, 2, 1, 0 – MUX4, MUX3, MUX2, MUX1, MUX0: ADC Channel Selection Bits

These 4 bits determine which analog inputs are connected to the ADC input. The different set-

ting are shown in Table 18-5.

If these bits are changed during a conversion, the change will not take effect until this conversion

is complete (it means while the ADIF bit in ADCSRA register is set).

18.9.2 ADC Control and Status Register A – ADCSRA

• Bit 7 – ADEN: ADC Enable Bit

Set this bit to enable the ADC.

Clear this bit to disable the ADC.

Clearing this bit while a conversion is running will take effect at the end of the conversion.

Table 18-5. ADC Input Channel Selection

MUX4 MUX3 MUX2 MUX1 MUX0 Description

00000ADC0

00001ADC1

00010ADC2

00011ADC3

00100ADC4

00101ADC5

00110ADC6

00111ADC7

01000ADC8

01001ADC9

01010ADC10

0 1 0 1 1 Temp Sensor

01100VCC/4

01101ISRC

01110AMP0

0 1 1 1 1 AMP1 (- is ADC8, + is ADC9)

10000AMP2 (- is ADC6)

1 0 0 0 1 Bandgap

10010GND

10011Reserved

101xxReserved

11xxxReserved

Bit 76543210

ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0 ADCSRA

Read/Write R/W R/W R/W R R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 238 239 240 241 242 243 244 245 246 247 248 ... 365 366

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